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ovs/lib/dpif-netdev.c
Justin Pettit 530180fd5a Support matching and modifying IP ECN bits. 
Signed-off-by: Justin Pettit <jpettit@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
2011-11-09 10:47:59 -08:00

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/*
* Copyright (c) 2009, 2010, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "dpif.h"
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <net/if.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
#include "csum.h"
#include "dpif.h"
#include "dpif-provider.h"
#include "dummy.h"
#include "dynamic-string.h"
#include "flow.h"
#include "hmap.h"
#include "list.h"
#include "netdev.h"
#include "netlink.h"
#include "odp-util.h"
#include "ofp-print.h"
#include "ofpbuf.h"
#include "packets.h"
#include "poll-loop.h"
#include "random.h"
#include "shash.h"
#include "timeval.h"
#include "util.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(dpif_netdev);
/* Configuration parameters. */
enum { MAX_PORTS = 256 }; /* Maximum number of ports. */
enum { MAX_FLOWS = 65536 }; /* Maximum number of flows in flow table. */
/* Enough headroom to add a vlan tag, plus an extra 2 bytes to allow IP
* headers to be aligned on a 4-byte boundary. */
enum { DP_NETDEV_HEADROOM = 2 + VLAN_HEADER_LEN };
/* Queues. */
enum { N_QUEUES = 2 }; /* Number of queues for dpif_recv(). */
enum { MAX_QUEUE_LEN = 128 }; /* Maximum number of packets per queue. */
enum { QUEUE_MASK = MAX_QUEUE_LEN - 1 };
BUILD_ASSERT_DECL(IS_POW2(MAX_QUEUE_LEN));
struct dp_netdev_queue {
struct dpif_upcall *upcalls[MAX_QUEUE_LEN];
unsigned int head, tail;
};
/* Datapath based on the network device interface from netdev.h. */
struct dp_netdev {
const struct dpif_class *class;
char *name;
int open_cnt;
bool destroyed;
struct dp_netdev_queue queues[N_QUEUES];
struct hmap flow_table; /* Flow table. */
/* Statistics. */
long long int n_hit; /* Number of flow table matches. */
long long int n_missed; /* Number of flow table misses. */
long long int n_lost; /* Number of misses not passed to client. */
/* Ports. */
struct dp_netdev_port *ports[MAX_PORTS];
struct list port_list;
unsigned int serial;
};
/* A port in a netdev-based datapath. */
struct dp_netdev_port {
int port_no; /* Index into dp_netdev's 'ports'. */
struct list node; /* Element in dp_netdev's 'port_list'. */
struct netdev *netdev;
bool internal; /* Internal port? */
};
/* A flow in dp_netdev's 'flow_table'. */
struct dp_netdev_flow {
struct hmap_node node; /* Element in dp_netdev's 'flow_table'. */
struct flow key;
/* Statistics. */
long long int used; /* Last used time, in monotonic msecs. */
long long int packet_count; /* Number of packets matched. */
long long int byte_count; /* Number of bytes matched. */
ovs_be16 tcp_ctl; /* Bitwise-OR of seen tcp_ctl values. */
/* Actions. */
struct nlattr *actions;
size_t actions_len;
};
/* Interface to netdev-based datapath. */
struct dpif_netdev {
struct dpif dpif;
struct dp_netdev *dp;
int listen_mask;
unsigned int dp_serial;
};
/* All netdev-based datapaths. */
static struct shash dp_netdevs = SHASH_INITIALIZER(&dp_netdevs);
/* Maximum port MTU seen so far. */
static int max_mtu = ETH_PAYLOAD_MAX;
static int get_port_by_number(struct dp_netdev *, uint16_t port_no,
struct dp_netdev_port **portp);
static int get_port_by_name(struct dp_netdev *, const char *devname,
struct dp_netdev_port **portp);
static void dp_netdev_free(struct dp_netdev *);
static void dp_netdev_flow_flush(struct dp_netdev *);
static int do_add_port(struct dp_netdev *, const char *devname,
const char *type, uint16_t port_no);
static int do_del_port(struct dp_netdev *, uint16_t port_no);
static int dpif_netdev_open(const struct dpif_class *, const char *name,
bool create, struct dpif **);
static int dp_netdev_output_userspace(struct dp_netdev *, const struct ofpbuf *,
int queue_no, const struct flow *,
uint64_t arg);
static void dp_netdev_execute_actions(struct dp_netdev *,
struct ofpbuf *, struct flow *,
const struct nlattr *actions,
size_t actions_len);
static struct dpif_class dpif_dummy_class;
static struct dpif_netdev *
dpif_netdev_cast(const struct dpif *dpif)
{
assert(dpif->dpif_class->open == dpif_netdev_open);
return CONTAINER_OF(dpif, struct dpif_netdev, dpif);
}
static struct dp_netdev *
get_dp_netdev(const struct dpif *dpif)
{
return dpif_netdev_cast(dpif)->dp;
}
static struct dpif *
create_dpif_netdev(struct dp_netdev *dp)
{
uint16_t netflow_id = hash_string(dp->name, 0);
struct dpif_netdev *dpif;
dp->open_cnt++;
dpif = xmalloc(sizeof *dpif);
dpif_init(&dpif->dpif, dp->class, dp->name, netflow_id >> 8, netflow_id);
dpif->dp = dp;
dpif->listen_mask = 0;
dpif->dp_serial = dp->serial;
return &dpif->dpif;
}
static int
create_dp_netdev(const char *name, const struct dpif_class *class,
struct dp_netdev **dpp)
{
struct dp_netdev *dp;
int error;
int i;
dp = xzalloc(sizeof *dp);
dp->class = class;
dp->name = xstrdup(name);
dp->open_cnt = 0;
for (i = 0; i < N_QUEUES; i++) {
dp->queues[i].head = dp->queues[i].tail = 0;
}
hmap_init(&dp->flow_table);
list_init(&dp->port_list);
error = do_add_port(dp, name, "internal", OVSP_LOCAL);
if (error) {
dp_netdev_free(dp);
return error;
}
shash_add(&dp_netdevs, name, dp);
*dpp = dp;
return 0;
}
static int
dpif_netdev_open(const struct dpif_class *class, const char *name,
bool create, struct dpif **dpifp)
{
struct dp_netdev *dp;
dp = shash_find_data(&dp_netdevs, name);
if (!dp) {
if (!create) {
return ENODEV;
} else {
int error = create_dp_netdev(name, class, &dp);
if (error) {
return error;
}
assert(dp != NULL);
}
} else {
if (dp->class != class) {
return EINVAL;
} else if (create) {
return EEXIST;
}
}
*dpifp = create_dpif_netdev(dp);
return 0;
}
static void
dp_netdev_purge_queues(struct dp_netdev *dp)
{
int i;
for (i = 0; i < N_QUEUES; i++) {
struct dp_netdev_queue *q = &dp->queues[i];
while (q->tail != q->head) {
struct dpif_upcall *upcall = q->upcalls[q->tail++ & QUEUE_MASK];
ofpbuf_delete(upcall->packet);
free(upcall);
}
}
}
static void
dp_netdev_free(struct dp_netdev *dp)
{
struct dp_netdev_port *port, *next;
dp_netdev_flow_flush(dp);
LIST_FOR_EACH_SAFE (port, next, node, &dp->port_list) {
do_del_port(dp, port->port_no);
}
dp_netdev_purge_queues(dp);
hmap_destroy(&dp->flow_table);
free(dp->name);
free(dp);
}
static void
dpif_netdev_close(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
assert(dp->open_cnt > 0);
if (--dp->open_cnt == 0 && dp->destroyed) {
shash_find_and_delete(&dp_netdevs, dp->name);
dp_netdev_free(dp);
}
free(dpif);
}
static int
dpif_netdev_destroy(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
dp->destroyed = true;
return 0;
}
static int
dpif_netdev_get_stats(const struct dpif *dpif, struct dpif_dp_stats *stats)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
stats->n_flows = hmap_count(&dp->flow_table);
stats->n_hit = dp->n_hit;
stats->n_missed = dp->n_missed;
stats->n_lost = dp->n_lost;
return 0;
}
static int
do_add_port(struct dp_netdev *dp, const char *devname, const char *type,
uint16_t port_no)
{
struct dp_netdev_port *port;
struct netdev *netdev;
bool internal;
int mtu;
int error;
/* XXX reject devices already in some dp_netdev. */
if (type[0] == '\0' || !strcmp(type, "system") || !strcmp(type, "dummy")) {
internal = false;
} else if (!strcmp(type, "internal")) {
internal = true;
} else {
VLOG_WARN("%s: unsupported port type %s", devname, type);
return EINVAL;
}
/* Open and validate network device. */
if (dp->class == &dpif_dummy_class) {
type = "dummy";
} else if (internal) {
type = "tap";
}
error = netdev_open(devname, type, &netdev);
if (error) {
return error;
}
/* XXX reject loopback devices */
/* XXX reject non-Ethernet devices */
error = netdev_listen(netdev);
if (error) {
VLOG_ERR("%s: cannot receive packets on this network device (%s)",
devname, strerror(errno));
netdev_close(netdev);
return error;
}
error = netdev_turn_flags_on(netdev, NETDEV_PROMISC, false);
if (error) {
netdev_close(netdev);
return error;
}
port = xmalloc(sizeof *port);
port->port_no = port_no;
port->netdev = netdev;
port->internal = internal;
error = netdev_get_mtu(netdev, &mtu);
if (!error) {
max_mtu = mtu;
}
list_push_back(&dp->port_list, &port->node);
dp->ports[port_no] = port;
dp->serial++;
return 0;
}
static int
dpif_netdev_port_add(struct dpif *dpif, struct netdev *netdev,
uint16_t *port_nop)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
int port_no;
for (port_no = 0; port_no < MAX_PORTS; port_no++) {
if (!dp->ports[port_no]) {
*port_nop = port_no;
return do_add_port(dp, netdev_get_name(netdev),
netdev_get_type(netdev), port_no);
}
}
return EFBIG;
}
static int
dpif_netdev_port_del(struct dpif *dpif, uint16_t port_no)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
return port_no == OVSP_LOCAL ? EINVAL : do_del_port(dp, port_no);
}
static bool
is_valid_port_number(uint16_t port_no)
{
return port_no < MAX_PORTS;
}
static int
get_port_by_number(struct dp_netdev *dp,
uint16_t port_no, struct dp_netdev_port **portp)
{
if (!is_valid_port_number(port_no)) {
*portp = NULL;
return EINVAL;
} else {
*portp = dp->ports[port_no];
return *portp ? 0 : ENOENT;
}
}
static int
get_port_by_name(struct dp_netdev *dp,
const char *devname, struct dp_netdev_port **portp)
{
struct dp_netdev_port *port;
LIST_FOR_EACH (port, node, &dp->port_list) {
if (!strcmp(netdev_get_name(port->netdev), devname)) {
*portp = port;
return 0;
}
}
return ENOENT;
}
static int
do_del_port(struct dp_netdev *dp, uint16_t port_no)
{
struct dp_netdev_port *port;
char *name;
int error;
error = get_port_by_number(dp, port_no, &port);
if (error) {
return error;
}
list_remove(&port->node);
dp->ports[port->port_no] = NULL;
dp->serial++;
name = xstrdup(netdev_get_name(port->netdev));
netdev_close(port->netdev);
free(name);
free(port);
return 0;
}
static void
answer_port_query(const struct dp_netdev_port *port,
struct dpif_port *dpif_port)
{
dpif_port->name = xstrdup(netdev_get_name(port->netdev));
dpif_port->type = xstrdup(port->internal ? "internal" : "system");
dpif_port->port_no = port->port_no;
}
static int
dpif_netdev_port_query_by_number(const struct dpif *dpif, uint16_t port_no,
struct dpif_port *dpif_port)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_port *port;
int error;
error = get_port_by_number(dp, port_no, &port);
if (!error) {
answer_port_query(port, dpif_port);
}
return error;
}
static int
dpif_netdev_port_query_by_name(const struct dpif *dpif, const char *devname,
struct dpif_port *dpif_port)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_port *port;
int error;
error = get_port_by_name(dp, devname, &port);
if (!error) {
answer_port_query(port, dpif_port);
}
return error;
}
static int
dpif_netdev_get_max_ports(const struct dpif *dpif OVS_UNUSED)
{
return MAX_PORTS;
}
static void
dp_netdev_free_flow(struct dp_netdev *dp, struct dp_netdev_flow *flow)
{
hmap_remove(&dp->flow_table, &flow->node);
free(flow->actions);
free(flow);
}
static void
dp_netdev_flow_flush(struct dp_netdev *dp)
{
struct dp_netdev_flow *flow, *next;
HMAP_FOR_EACH_SAFE (flow, next, node, &dp->flow_table) {
dp_netdev_free_flow(dp, flow);
}
}
static int
dpif_netdev_flow_flush(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
dp_netdev_flow_flush(dp);
return 0;
}
struct dp_netdev_port_state {
uint32_t port_no;
char *name;
};
static int
dpif_netdev_port_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep)
{
*statep = xzalloc(sizeof(struct dp_netdev_port_state));
return 0;
}
static int
dpif_netdev_port_dump_next(const struct dpif *dpif, void *state_,
struct dpif_port *dpif_port)
{
struct dp_netdev_port_state *state = state_;
struct dp_netdev *dp = get_dp_netdev(dpif);
uint32_t port_no;
for (port_no = state->port_no; port_no < MAX_PORTS; port_no++) {
struct dp_netdev_port *port = dp->ports[port_no];
if (port) {
free(state->name);
state->name = xstrdup(netdev_get_name(port->netdev));
dpif_port->name = state->name;
dpif_port->type = port->internal ? "internal" : "system";
dpif_port->port_no = port->port_no;
state->port_no = port_no + 1;
return 0;
}
}
return EOF;
}
static int
dpif_netdev_port_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_)
{
struct dp_netdev_port_state *state = state_;
free(state->name);
free(state);
return 0;
}
static int
dpif_netdev_port_poll(const struct dpif *dpif_, char **devnamep OVS_UNUSED)
{
struct dpif_netdev *dpif = dpif_netdev_cast(dpif_);
if (dpif->dp_serial != dpif->dp->serial) {
dpif->dp_serial = dpif->dp->serial;
return ENOBUFS;
} else {
return EAGAIN;
}
}
static void
dpif_netdev_port_poll_wait(const struct dpif *dpif_)
{
struct dpif_netdev *dpif = dpif_netdev_cast(dpif_);
if (dpif->dp_serial != dpif->dp->serial) {
poll_immediate_wake();
}
}
static struct dp_netdev_flow *
dp_netdev_lookup_flow(const struct dp_netdev *dp, const struct flow *key)
{
struct dp_netdev_flow *flow;
HMAP_FOR_EACH_WITH_HASH (flow, node, flow_hash(key, 0), &dp->flow_table) {
if (flow_equal(&flow->key, key)) {
return flow;
}
}
return NULL;
}
static void
get_dpif_flow_stats(struct dp_netdev_flow *flow, struct dpif_flow_stats *stats)
{
stats->n_packets = flow->packet_count;
stats->n_bytes = flow->byte_count;
stats->used = flow->used;
stats->tcp_flags = TCP_FLAGS(flow->tcp_ctl);
}
static int
dpif_netdev_flow_from_nlattrs(const struct nlattr *key, uint32_t key_len,
struct flow *flow)
{
if (odp_flow_key_to_flow(key, key_len, flow)) {
/* This should not happen: it indicates that odp_flow_key_from_flow()
* and odp_flow_key_to_flow() disagree on the acceptable form of a
* flow. Log the problem as an error, with enough details to enable
* debugging. */
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
if (!VLOG_DROP_ERR(&rl)) {
struct ds s;
ds_init(&s);
odp_flow_key_format(key, key_len, &s);
VLOG_ERR("internal error parsing flow key %s", ds_cstr(&s));
ds_destroy(&s);
}
return EINVAL;
}
if (flow->in_port < OFPP_MAX
? flow->in_port >= MAX_PORTS
: flow->in_port != OFPP_LOCAL && flow->in_port != OFPP_NONE) {
return EINVAL;
}
return 0;
}
static int
dpif_netdev_flow_get(const struct dpif *dpif,
const struct nlattr *nl_key, size_t nl_key_len,
struct ofpbuf **actionsp, struct dpif_flow_stats *stats)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *flow;
struct flow key;
int error;
error = dpif_netdev_flow_from_nlattrs(nl_key, nl_key_len, &key);
if (error) {
return error;
}
flow = dp_netdev_lookup_flow(dp, &key);
if (!flow) {
return ENOENT;
}
if (stats) {
get_dpif_flow_stats(flow, stats);
}
if (actionsp) {
*actionsp = ofpbuf_clone_data(flow->actions, flow->actions_len);
}
return 0;
}
static int
set_flow_actions(struct dp_netdev_flow *flow,
const struct nlattr *actions, size_t actions_len)
{
flow->actions = xrealloc(flow->actions, actions_len);
flow->actions_len = actions_len;
memcpy(flow->actions, actions, actions_len);
return 0;
}
static int
add_flow(struct dpif *dpif, const struct flow *key,
const struct nlattr *actions, size_t actions_len)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *flow;
int error;
flow = xzalloc(sizeof *flow);
flow->key = *key;
error = set_flow_actions(flow, actions, actions_len);
if (error) {
free(flow);
return error;
}
hmap_insert(&dp->flow_table, &flow->node, flow_hash(&flow->key, 0));
return 0;
}
static void
clear_stats(struct dp_netdev_flow *flow)
{
flow->used = 0;
flow->packet_count = 0;
flow->byte_count = 0;
flow->tcp_ctl = 0;
}
static int
dpif_netdev_flow_put(struct dpif *dpif, enum dpif_flow_put_flags flags,
const struct nlattr *nl_key, size_t nl_key_len,
const struct nlattr *actions, size_t actions_len,
struct dpif_flow_stats *stats)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *flow;
struct flow key;
int error;
error = dpif_netdev_flow_from_nlattrs(nl_key, nl_key_len, &key);
if (error) {
return error;
}
flow = dp_netdev_lookup_flow(dp, &key);
if (!flow) {
if (flags & DPIF_FP_CREATE) {
if (hmap_count(&dp->flow_table) < MAX_FLOWS) {
if (stats) {
memset(stats, 0, sizeof *stats);
}
return add_flow(dpif, &key, actions, actions_len);
} else {
return EFBIG;
}
} else {
return ENOENT;
}
} else {
if (flags & DPIF_FP_MODIFY) {
int error = set_flow_actions(flow, actions, actions_len);
if (!error) {
if (stats) {
get_dpif_flow_stats(flow, stats);
}
if (flags & DPIF_FP_ZERO_STATS) {
clear_stats(flow);
}
}
return error;
} else {
return EEXIST;
}
}
}
static int
dpif_netdev_flow_del(struct dpif *dpif,
const struct nlattr *nl_key, size_t nl_key_len,
struct dpif_flow_stats *stats)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *flow;
struct flow key;
int error;
error = dpif_netdev_flow_from_nlattrs(nl_key, nl_key_len, &key);
if (error) {
return error;
}
flow = dp_netdev_lookup_flow(dp, &key);
if (flow) {
if (stats) {
get_dpif_flow_stats(flow, stats);
}
dp_netdev_free_flow(dp, flow);
return 0;
} else {
return ENOENT;
}
}
struct dp_netdev_flow_state {
uint32_t bucket;
uint32_t offset;
struct nlattr *actions;
struct odputil_keybuf keybuf;
struct dpif_flow_stats stats;
};
static int
dpif_netdev_flow_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep)
{
struct dp_netdev_flow_state *state;
*statep = state = xmalloc(sizeof *state);
state->bucket = 0;
state->offset = 0;
state->actions = NULL;
return 0;
}
static int
dpif_netdev_flow_dump_next(const struct dpif *dpif, void *state_,
const struct nlattr **key, size_t *key_len,
const struct nlattr **actions, size_t *actions_len,
const struct dpif_flow_stats **stats)
{
struct dp_netdev_flow_state *state = state_;
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *flow;
struct hmap_node *node;
node = hmap_at_position(&dp->flow_table, &state->bucket, &state->offset);
if (!node) {
return EOF;
}
flow = CONTAINER_OF(node, struct dp_netdev_flow, node);
if (key) {
struct ofpbuf buf;
ofpbuf_use_stack(&buf, &state->keybuf, sizeof state->keybuf);
odp_flow_key_from_flow(&buf, &flow->key);
*key = buf.data;
*key_len = buf.size;
}
if (actions) {
free(state->actions);
state->actions = xmemdup(flow->actions, flow->actions_len);
*actions = state->actions;
*actions_len = flow->actions_len;
}
if (stats) {
get_dpif_flow_stats(flow, &state->stats);
*stats = &state->stats;
}
return 0;
}
static int
dpif_netdev_flow_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_)
{
struct dp_netdev_flow_state *state = state_;
free(state->actions);
free(state);
return 0;
}
static int
dpif_netdev_execute(struct dpif *dpif,
const struct nlattr *key_attrs, size_t key_len,
const struct nlattr *actions, size_t actions_len,
const struct ofpbuf *packet)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct ofpbuf copy;
struct flow key;
int error;
if (packet->size < ETH_HEADER_LEN || packet->size > UINT16_MAX) {
return EINVAL;
}
/* Make a deep copy of 'packet', because we might modify its data. */
ofpbuf_init(&copy, DP_NETDEV_HEADROOM + packet->size);
ofpbuf_reserve(&copy, DP_NETDEV_HEADROOM);
ofpbuf_put(&copy, packet->data, packet->size);
flow_extract(&copy, 0, 0, -1, &key);
error = dpif_netdev_flow_from_nlattrs(key_attrs, key_len, &key);
if (!error) {
dp_netdev_execute_actions(dp, &copy, &key,
actions, actions_len);
}
ofpbuf_uninit(&copy);
return error;
}
static int
dpif_netdev_recv_get_mask(const struct dpif *dpif, int *listen_mask)
{
struct dpif_netdev *dpif_netdev = dpif_netdev_cast(dpif);
*listen_mask = dpif_netdev->listen_mask;
return 0;
}
static int
dpif_netdev_recv_set_mask(struct dpif *dpif, int listen_mask)
{
struct dpif_netdev *dpif_netdev = dpif_netdev_cast(dpif);
dpif_netdev->listen_mask = listen_mask;
return 0;
}
static struct dp_netdev_queue *
find_nonempty_queue(struct dpif *dpif)
{
struct dpif_netdev *dpif_netdev = dpif_netdev_cast(dpif);
struct dp_netdev *dp = get_dp_netdev(dpif);
int mask = dpif_netdev->listen_mask;
int i;
for (i = 0; i < N_QUEUES; i++) {
struct dp_netdev_queue *q = &dp->queues[i];
if (q->head != q->tail && mask & (1u << i)) {
return q;
}
}
return NULL;
}
static int
dpif_netdev_recv(struct dpif *dpif, struct dpif_upcall *upcall)
{
struct dp_netdev_queue *q = find_nonempty_queue(dpif);
if (q) {
struct dpif_upcall *u = q->upcalls[q->tail++ & QUEUE_MASK];
*upcall = *u;
free(u);
return 0;
} else {
return EAGAIN;
}
}
static void
dpif_netdev_recv_wait(struct dpif *dpif)
{
if (find_nonempty_queue(dpif)) {
poll_immediate_wake();
} else {
/* No messages ready to be received, and dp_wait() will ensure that we
* wake up to queue new messages, so there is nothing to do. */
}
}
static void
dpif_netdev_recv_purge(struct dpif *dpif)
{
struct dpif_netdev *dpif_netdev = dpif_netdev_cast(dpif);
dp_netdev_purge_queues(dpif_netdev->dp);
}
static void
dp_netdev_flow_used(struct dp_netdev_flow *flow, struct flow *key,
const struct ofpbuf *packet)
{
flow->used = time_msec();
flow->packet_count++;
flow->byte_count += packet->size;
if (key->dl_type == htons(ETH_TYPE_IP) && key->nw_proto == IPPROTO_TCP) {
struct tcp_header *th = packet->l4;
flow->tcp_ctl |= th->tcp_ctl;
}
}
static void
dp_netdev_port_input(struct dp_netdev *dp, struct dp_netdev_port *port,
struct ofpbuf *packet)
{
struct dp_netdev_flow *flow;
struct flow key;
if (packet->size < ETH_HEADER_LEN) {
return;
}
flow_extract(packet, 0, 0, port->port_no, &key);
flow = dp_netdev_lookup_flow(dp, &key);
if (flow) {
dp_netdev_flow_used(flow, &key, packet);
dp_netdev_execute_actions(dp, packet, &key,
flow->actions, flow->actions_len);
dp->n_hit++;
} else {
dp->n_missed++;
dp_netdev_output_userspace(dp, packet, DPIF_UC_MISS, &key, 0);
}
}
static void
dpif_netdev_run(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_port *port;
struct ofpbuf packet;
ofpbuf_init(&packet, DP_NETDEV_HEADROOM + VLAN_ETH_HEADER_LEN + max_mtu);
LIST_FOR_EACH (port, node, &dp->port_list) {
int error;
/* Reset packet contents. */
ofpbuf_clear(&packet);
ofpbuf_reserve(&packet, DP_NETDEV_HEADROOM);
error = netdev_recv(port->netdev, &packet);
if (!error) {
dp_netdev_port_input(dp, port, &packet);
} else if (error != EAGAIN && error != EOPNOTSUPP) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
VLOG_ERR_RL(&rl, "error receiving data from %s: %s",
netdev_get_name(port->netdev), strerror(error));
}
}
ofpbuf_uninit(&packet);
}
static void
dpif_netdev_wait(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_port *port;
LIST_FOR_EACH (port, node, &dp->port_list) {
netdev_recv_wait(port->netdev);
}
}
static void
dp_netdev_pop_vlan(struct ofpbuf *packet)
{
struct vlan_eth_header *veh = packet->l2;
if (packet->size >= sizeof *veh
&& veh->veth_type == htons(ETH_TYPE_VLAN)) {
struct eth_header tmp;
memcpy(tmp.eth_dst, veh->veth_dst, ETH_ADDR_LEN);
memcpy(tmp.eth_src, veh->veth_src, ETH_ADDR_LEN);
tmp.eth_type = veh->veth_next_type;
ofpbuf_pull(packet, VLAN_HEADER_LEN);
packet->l2 = (char*)packet->l2 + VLAN_HEADER_LEN;
memcpy(packet->data, &tmp, sizeof tmp);
}
}
static void
dp_netdev_set_dl(struct ofpbuf *packet, const struct ovs_key_ethernet *eth_key)
{
struct eth_header *eh = packet->l2;
memcpy(eh->eth_src, eth_key->eth_src, sizeof eh->eth_src);
memcpy(eh->eth_dst, eth_key->eth_dst, sizeof eh->eth_dst);
}
static void
dp_netdev_set_ip_addr(struct ofpbuf *packet, ovs_be32 *addr, ovs_be32 new_addr)
{
struct ip_header *nh = packet->l3;
if (nh->ip_proto == IPPROTO_TCP && packet->l7) {
struct tcp_header *th = packet->l4;
th->tcp_csum = recalc_csum32(th->tcp_csum, *addr, new_addr);
} else if (nh->ip_proto == IPPROTO_UDP && packet->l7) {
struct udp_header *uh = packet->l4;
if (uh->udp_csum) {
uh->udp_csum = recalc_csum32(uh->udp_csum, *addr, new_addr);
if (!uh->udp_csum) {
uh->udp_csum = htons(0xffff);
}
}
}
nh->ip_csum = recalc_csum32(nh->ip_csum, *addr, new_addr);
*addr = new_addr;
}
static void
dp_netdev_set_ip_tos(struct ip_header *nh, uint8_t new_tos)
{
uint8_t *field = &nh->ip_tos;
nh->ip_csum = recalc_csum16(nh->ip_csum, htons((uint16_t)*field),
htons((uint16_t) new_tos));
*field = new_tos;
}
static void
dp_netdev_set_ipv4(struct ofpbuf *packet, const struct ovs_key_ipv4 *ipv4_key)
{
struct ip_header *nh = packet->l3;
if (nh->ip_src != ipv4_key->ipv4_src) {
dp_netdev_set_ip_addr(packet, &nh->ip_src, ipv4_key->ipv4_src);
}
if (nh->ip_dst != ipv4_key->ipv4_dst) {
dp_netdev_set_ip_addr(packet, &nh->ip_dst, ipv4_key->ipv4_dst);
}
if (nh->ip_tos != ipv4_key->ipv4_tos) {
dp_netdev_set_ip_tos(nh, ipv4_key->ipv4_tos);
}
}
static void
dp_netdev_set_port(ovs_be16 *port, ovs_be16 new_port, ovs_be16 *csum)
{
*csum = recalc_csum16(*csum, *port, new_port);
*port = new_port;
}
static void
dp_netdev_set_tcp_port(struct ofpbuf *packet, const struct ovs_key_tcp *tcp_key)
{
struct tcp_header *th = packet->l4;
if (th->tcp_src != tcp_key->tcp_src) {
dp_netdev_set_port(&th->tcp_src, tcp_key->tcp_src, &th->tcp_csum);
}
if (th->tcp_dst != tcp_key->tcp_dst) {
dp_netdev_set_port(&th->tcp_dst, tcp_key->tcp_dst, &th->tcp_csum);
}
}
static void
dp_netdev_set_udp_port(struct ofpbuf *packet, const struct ovs_key_udp *udp_key)
{
struct udp_header *uh = packet->l4;
if (uh->udp_src != udp_key->udp_src) {
dp_netdev_set_port(&uh->udp_src, udp_key->udp_src, &uh->udp_csum);
}
if (uh->udp_dst != udp_key->udp_dst) {
dp_netdev_set_port(&uh->udp_dst, udp_key->udp_dst, &uh->udp_csum);
}
}
static void
dp_netdev_output_port(struct dp_netdev *dp, struct ofpbuf *packet,
uint16_t out_port)
{
struct dp_netdev_port *p = dp->ports[out_port];
if (p) {
netdev_send(p->netdev, packet);
}
}
static int
dp_netdev_output_userspace(struct dp_netdev *dp, const struct ofpbuf *packet,
int queue_no, const struct flow *flow, uint64_t arg)
{
struct dp_netdev_queue *q = &dp->queues[queue_no];
struct dpif_upcall *upcall;
struct ofpbuf *buf;
size_t key_len;
if (q->head - q->tail >= MAX_QUEUE_LEN) {
dp->n_lost++;
return ENOBUFS;
}
buf = ofpbuf_new(ODPUTIL_FLOW_KEY_BYTES + 2 + packet->size);
odp_flow_key_from_flow(buf, flow);
key_len = buf->size;
ofpbuf_pull(buf, key_len);
ofpbuf_reserve(buf, 2);
ofpbuf_put(buf, packet->data, packet->size);
upcall = xzalloc(sizeof *upcall);
upcall->type = queue_no;
upcall->packet = buf;
upcall->key = buf->base;
upcall->key_len = key_len;
upcall->userdata = arg;
q->upcalls[q->head++ & QUEUE_MASK] = upcall;
return 0;
}
static void
dp_netdev_sample(struct dp_netdev *dp,
struct ofpbuf *packet, struct flow *key,
const struct nlattr *action)
{
const struct nlattr *subactions = NULL;
const struct nlattr *a;
size_t left;
NL_NESTED_FOR_EACH_UNSAFE (a, left, action) {
int type = nl_attr_type(a);
switch ((enum ovs_sample_attr) type) {
case OVS_SAMPLE_ATTR_PROBABILITY:
if (random_uint32() >= nl_attr_get_u32(a)) {
return;
}
break;
case OVS_SAMPLE_ATTR_ACTIONS:
subactions = a;
break;
case OVS_SAMPLE_ATTR_UNSPEC:
case __OVS_SAMPLE_ATTR_MAX:
default:
NOT_REACHED();
}
}
dp_netdev_execute_actions(dp, packet, key, nl_attr_get(subactions),
nl_attr_get_size(subactions));
}
static void
dp_netdev_action_userspace(struct dp_netdev *dp,
struct ofpbuf *packet, struct flow *key,
const struct nlattr *a)
{
const struct nlattr *userdata_attr;
uint64_t userdata;
userdata_attr = nl_attr_find_nested(a, OVS_USERSPACE_ATTR_USERDATA);
userdata = userdata_attr ? nl_attr_get_u64(userdata_attr) : 0;
dp_netdev_output_userspace(dp, packet, DPIF_UC_ACTION, key, userdata);
}
static void
execute_set_action(struct ofpbuf *packet, const struct nlattr *a)
{
enum ovs_key_attr type = nl_attr_type(a);
switch (type) {
case OVS_KEY_ATTR_TUN_ID:
case OVS_KEY_ATTR_PRIORITY:
/* not implemented */
break;
case OVS_KEY_ATTR_ETHERNET:
dp_netdev_set_dl(packet,
nl_attr_get_unspec(a, sizeof(struct ovs_key_ethernet)));
break;
case OVS_KEY_ATTR_IPV4:
dp_netdev_set_ipv4(packet,
nl_attr_get_unspec(a, sizeof(struct ovs_key_ipv4)));
break;
case OVS_KEY_ATTR_TCP:
dp_netdev_set_tcp_port(packet,
nl_attr_get_unspec(a, sizeof(struct ovs_key_tcp)));
break;
case OVS_KEY_ATTR_UDP:
dp_netdev_set_udp_port(packet,
nl_attr_get_unspec(a, sizeof(struct ovs_key_udp)));
break;
case OVS_KEY_ATTR_UNSPEC:
case OVS_KEY_ATTR_ETHERTYPE:
case OVS_KEY_ATTR_IPV6:
case OVS_KEY_ATTR_IN_PORT:
case OVS_KEY_ATTR_8021Q:
case OVS_KEY_ATTR_ICMP:
case OVS_KEY_ATTR_ICMPV6:
case OVS_KEY_ATTR_ARP:
case OVS_KEY_ATTR_ND:
case __OVS_KEY_ATTR_MAX:
default:
NOT_REACHED();
}
}
static void
dp_netdev_execute_actions(struct dp_netdev *dp,
struct ofpbuf *packet, struct flow *key,
const struct nlattr *actions,
size_t actions_len)
{
const struct nlattr *a;
unsigned int left;
NL_ATTR_FOR_EACH_UNSAFE (a, left, actions, actions_len) {
const struct nlattr *nested;
const struct ovs_key_8021q *q_key;
int type = nl_attr_type(a);
switch ((enum ovs_action_attr) type) {
case OVS_ACTION_ATTR_OUTPUT:
dp_netdev_output_port(dp, packet, nl_attr_get_u32(a));
break;
case OVS_ACTION_ATTR_USERSPACE:
dp_netdev_action_userspace(dp, packet, key, a);
break;
case OVS_ACTION_ATTR_PUSH:
nested = nl_attr_get(a);
assert(nl_attr_type(nested) == OVS_KEY_ATTR_8021Q);
q_key = nl_attr_get_unspec(nested, sizeof(*q_key));
eth_push_vlan(packet, q_key->q_tci);
break;
case OVS_ACTION_ATTR_POP:
assert(nl_attr_get_u16(a) == OVS_KEY_ATTR_8021Q);
dp_netdev_pop_vlan(packet);
break;
case OVS_ACTION_ATTR_SET:
execute_set_action(packet, nl_attr_get(a));
break;
case OVS_ACTION_ATTR_SAMPLE:
dp_netdev_sample(dp, packet, key, a);
break;
case OVS_ACTION_ATTR_UNSPEC:
case __OVS_ACTION_ATTR_MAX:
NOT_REACHED();
}
}
}
const struct dpif_class dpif_netdev_class = {
"netdev",
NULL, /* enumerate */
dpif_netdev_open,
dpif_netdev_close,
dpif_netdev_destroy,
dpif_netdev_run,
dpif_netdev_wait,
dpif_netdev_get_stats,
dpif_netdev_port_add,
dpif_netdev_port_del,
dpif_netdev_port_query_by_number,
dpif_netdev_port_query_by_name,
dpif_netdev_get_max_ports,
NULL, /* port_get_pid */
dpif_netdev_port_dump_start,
dpif_netdev_port_dump_next,
dpif_netdev_port_dump_done,
dpif_netdev_port_poll,
dpif_netdev_port_poll_wait,
dpif_netdev_flow_get,
dpif_netdev_flow_put,
dpif_netdev_flow_del,
dpif_netdev_flow_flush,
dpif_netdev_flow_dump_start,
dpif_netdev_flow_dump_next,
dpif_netdev_flow_dump_done,
dpif_netdev_execute,
NULL, /* operate */
dpif_netdev_recv_get_mask,
dpif_netdev_recv_set_mask,
NULL, /* queue_to_priority */
dpif_netdev_recv,
dpif_netdev_recv_wait,
dpif_netdev_recv_purge,
};
void
dpif_dummy_register(void)
{
if (!dpif_dummy_class.type) {
dpif_dummy_class = dpif_netdev_class;
dpif_dummy_class.type = "dummy";
dp_register_provider(&dpif_dummy_class);
}
}
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